\begin{tikzpicture}[>=Stealth, scale=0.8, transform shape]
    \tikzset{
        circuit/.pic={
            \draw (0, 0) -- (2, 0) -- (2, 0.7);
            \draw (2, 1.7) -- (2, 1) -- (1, 1) -- (1, -1) -- (2, -1) -- (2, -0.3);
            \draw [fill=black] (1, 0) circle (0.08);
        }
    }
    \draw (0, 0) pic {circuit};
    \draw [xscale=-1] (-4.5, 0) pic {circuit};

    \node at (1.7, 1.3) {\small $J_A$};
    \node at (1.7, 0.3) {\small $J_B$};
    \node at (1.7, -0.7) {\small $J_C$};
\end{tikzpicture}
